It's an instance.
It's a hard instance.
It's pretty normal for us not to tell you what monsters are lurking in there, because we want all of you to die in misery.
Several times, preferably.
This way your won't gain 30 levels in 2 months and then - you won't whine for new provinces all the time.
Monsters have classes also.
Just like items, they could be rare, legendary and epic...
So...
Good luck to all of you in the Nightlord's Mother